Maybe the SkySail could own the sail system and sell the "thrust" - basically charging a success fee for saved fuel. In a similar vein in how the airlines don't

Maybe the SkySail could own the sail system and sell the "thrust" - basically charging a success fee for saved fuel. In a similar vein in how the airlines don't own the engines of their airplanes but rent them from manufacturer - https://aviation.stackexchange.com/questions/12528/jet-engines-are-they-owned-by-the-airline-or-just-rented https://aviation.stackexchange.com/questions/12528/jet-engin... Of course this is an armchair thought experiment, but I am curious about your opinions.